Definition of Hypomagnesemia

Hypomagnesemia: Low magnesium in the blood, which can occur due to inadequate intake or impaired intestinal absorption of magnesium. Hypomagnesemia is often associated with low calcium (hypocalcemia) and low potassium (hypokalemia). It causes increased irritability of the nervous system with tetany (spasms of the hands and feet, muscular twitching and cramps, spasm of the larynx, and overly active reflexes).